linux-kernel - Re: [PATCH] sparc32: Implement xchg and atomic_xchg using ATOMIC

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Date:	Fri, 07 Nov 2014 15:52:14 -0500 (EST)
From:	David Miller <davem@...hat.com>
To:	andreas@...sler.com
Cc:	sparclinux@...r.kernel.org, sam@...nborg.org,
	linux-kernel@...r.kernel.org, software@...sler.com
Subject: Re: [PATCH] sparc32: Implement xchg and atomic_xchg using
 ATOMIC_HASH locks

From: Andreas Larsson <andreas@...sler.com>
Date: Wed,  5 Nov 2014 15:52:08 +0100

> Atomicity between xchg and cmpxchg cannot be guaranteed when xchg is
> implemented with a swap and cmpxchg is implemented with locks.
> Without this, e.g. mcs_spin_lock and mcs_spin_unlock are broken.
> 
> Signed-off-by: Andreas Larsson <andreas@...sler.com>

Unfortunate, but obviously necessary.

Applied and queued up for -stable, thanks!
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